I have a .308 axis SR with factory threaded barrel, and I didnt see anywhere in the paperwork, box or website that stated the thread pitch. I dont own any guages or dies to see what it would be through trial and error. By my somewhat astute, non-scientific, backwoods guestimation, I would say they are 5/8x24. Anyone know for sure? Im looking to buy a muzzle brake soon. Sooner the better lol